Java File Size Get countFileDisplaySize(long size)

Description

count File Display Size

License

Open Source License

Declaration

public static String countFileDisplaySize(long size) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.NumberFormat;

public class Main {
    /**/*from   w  w w.  j  a  v a 2  s. co  m*/
     * The number of bytes in a kilobyte.
     */
    public static final long ONE_KB = 1024;
    /**
     * The number of bytes in a megabyte.
     */
    public static final long ONE_MB = ONE_KB * ONE_KB;
    /**
     * The number of bytes in a gigabyte.
     */
    public static final long ONE_GB = ONE_KB * ONE_MB;

    public static String countFileDisplaySize(long size) {
        String displaySize;
        if (size / ONE_GB > 0) {
            displaySize = format(Math.floor(size * 100.0 / ONE_GB) / 100) + "G";
        } else if (size / ONE_MB > 0) {
            displaySize = format(Math.floor(size * 100.0 / ONE_MB) / 100) + "M";
        } else if (size / ONE_KB > 0) {
            displaySize = format(Math.floor(size * 100.0 / ONE_KB) / 100) + "K";
        } else {
            displaySize = size + "Bytes";
        }
        return displaySize;
    }

    private static String format(double number) {
        NumberFormat format = NumberFormat.getNumberInstance();
        format.setMaximumFractionDigits(2);
        format.setMinimumFractionDigits(0);
        format.setGroupingUsed(false);
        return format.format(number);
    }
}

Related

1. countFileSize(String pathname)
2. fileSizeString(long bytes)
3. getFileKBSize(long fsize)
4. getFileSize(@Nonnull File file)